Quarterly report pursuant to Section 13 or 15(d)

Derivative Instruments and Hedging Activities Schedule of Interest Rate Swaps Associated with TBA Contracts (Details)

v2.4.0.6
Derivative Instruments and Hedging Activities Schedule of Interest Rate Swaps Associated with TBA Contracts (Details) (Interest Rate Swaps Associated with TBA Contracts [Member], USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
Derivative [Line Items]  
Derivative, Notional Amount $ 175,000
More than Four and within Five Years from Balance Sheet Date [Member]
 
Derivative [Line Items]  
Derivative, Notional Amount $ 175,000
Derivative, Average Fixed Interest Rate 0.4196%
Derivative, Average Variable Interest Rate 1.772%
Derivative, Average Remaining Maturity 4.5778